Safety Study of the PulseRider® in Patients Undergoing Treatment for Bifurcation Intracranial Aneurysms

Inclusion Criteria: 1. Patient who presents with an MRA, CTA or angiographically confirmed, wide neck (\> 4 mm or dome to neck ratio \< 2) intracranial aneurysms located at a bifurcation 2. The target aneurysm is in a vessel with a diameter of 2.7 mm to 4.5mm. 3. The patient is 18 years or older at the time of consent 4. The patient has signed the IRB/EC approved informed consent form 5. In the opinion of the physician, placement of the PulseRider is technically feasible and clinically indicated 6. Subject has mental capacity and is willing and able to comply with protocol requirements and follow-up Exclusion Criteria: 1. Unstable neurological deficit (condition worsening within the last 90 days) 2. Subarachnoid Hemorrhage (SAH) within the last 60 days 3. Irreversible bleeding disorder 4. mRS score ≥3 5. Patient has another aneurysm which, in the Investigator's opinion, will require treatment within the follow up period (365 days) 6. Platelet count \< 100 x 103 cells/mm3or known platelet dysfunction 7. Inability to tolerate, adverse reaction or contraindication to taking aspirin or clopidogrel 8. A history of contrast allergy that cannot be medically controlled 9. Known allergy to nickel 10. Relative contraindication to angiography (e.g., serum creatinine \> 2.5 mg/dL) 11. Woman with child-bearing potential who cannot provide a negative pregnancy test 12. Evidence of active infection (fever with temperature \> 38°C and/or WBC \> 15,000) 13. Other conditions of the heart, blood, brain or intracranial vessels that carry a high risk of neurologic events 14. Evidence of disease or condition expected to compromise survival or ability to complete follow-up assessments during the 365-day follow-up period 15. Extracranial stenosis greater than 50% in the parent artery requiring access to the lesion 16. Intracranial stenosis greater than 50% in the treated vessel 17. Extreme vessel tortuosity that prohibits appropriate control of the micro-guide wire and/or the PulseRider delivery wire